Horn.



W. SPARKS.

Patented Dec. 24, 1912.

lint H UNITED STATES PATENT OFFICE.

WILLIAM SPARKS, OF JACKSON, MICHIGAN.

HORN.

Specification of Letters Patent.

Patented Dec. 24, 1912.-

Application filed May 9, 1912. Serial No. 696,216.

To all whom 'i; may concern:

Be it known that I, WILLIAM SrAnKs, of Jackson, in the county of Jackson, in the State of Michigan, have invented new and useful Improvements in Horns, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact descrlption.

This invention relates to certain improvements in horns. for automobiles and other 7 self-propelled vehicles in which an electric motoris employed as the driving element for a suitable sound producing device consisting of a diaphragm having a projection thereon and a toothed member actuated bythe mO- proper relation to compensate for wear.

Other objects and uses will be brought out in the following description.

In the drawingsFigure 1 is a side elevation of a horn embodying the various features of my invention. Fig. 2 is an enlarged sectional view through the motor and diaphragm and inclosing case therefor show ing more particularly the means for ad-. justing the sound producing members. Figs. 3 and 4 are transverse sectional views through the motor case and shell taken respectively on lines 33 and 44, Fig. 1. Fig. 5'is a perspective view of the rotary sound producing member. Fig. 6 is a detail sectional view through the projection on the diaphragm showing a face view of a portion of the toothed wheel.

The horn herein illustrated is of the combination type adapted to be operated electrically or by a pneumatic compression bulb, and for this pur ose isprovlded with an amplifier 1-- rigidly secured to one end of a motor case -2 and provided with a branch tubular extension 3' extending lengthwise along and partially across one u end of the motor case -2- for connection with any suitable tube to which the compression bulb (not shown) is attached.

The amplifier 1- preferably consists of two oppositely flaring sections 4 and -5- having their small ends telescoping and fitted snugly one upon the other as shown more clearly in Fig. 2, the section 1 being of considerably greater length than the section 5 which latter has a more abrupt flare for direct application to the marginal edges of a suitable diaphragm -6- so as to leave a clear open space for the vibration of the central portion of the diaphragm and passage'for the sound waves produced thereby. w

The motor. case 2, mmprises a cylindricalcup-shape jacket 7 preferably of sheet metal and an enlarged cast metal ring 8- secured by suitable fastening means as screws -9 'to the open end of the jacket.--7-as shown more clearly in Figs.

'1 and 2.

The motor which is inclosed within the casing -2 comprises a cylindrical cupshape shell 10 of cast iron or other magnetizablematerial arranged coaxially within the jacket 7- with its closed end facing the diaphragm 6- and threaded externally for receiving the internally threaded ring -8 and thereby permitting said shell and ring to be adjusted endwise relatively to each other for a purpose hereinafter described, the shell 10'- and ring -8- being locked in their adjusted positions by a jam nut 11 also engaging the externally'threaded portion of the shell -10. The intermediate portion of the .shell -10-- is provided with inwardly projecting diametrically opposed pole pieces -12 integral therewith and spaced apart a sufficient distance to receive a rotary armature --13.

Surrounding the pole pieces are field coils 14 having one end thereof electrically connected to suitable brushes 15 which contact with the periphery of a commutator 16 on the outer end of the armature shaft as 17-, the other ends of thecoils being passed through apertures 18 in a cap 19- covering the outer end of the shell -1( and are connected to binding posts '20.

The armature. shaft -17- is journaled for axial adjustment in suitable bearings -2l and 22' on the inner end of the shell and cap 19- respectively, the

bearing 22 being provided with an endthrust ball bearing 23- and is threaded externally and engaged in 'a threaded aperture centrally in the cap 19 for the purpose of adjusting theashaft endwise to bring the sound producing members, presently described, into proper relation, said bearing shell -10 by suitable fastening means as screws 25, and is also preferably made of cast metal and adapted to form a continuation of the shell -10 to completely house the'armature and field of the motor, thereby excluding dust or other foreign matter therefrom.

A toothed wheel -'27' is rigidly secured to the inner angular end'of the shaft -17 by means of a clamping nut 28- and is provided with beveled-face teeth operating against a projection 29 which is secured by a rivet or other fastening means to the diaphragm 6 in the path of the teeth of the wheel ,27 so as to vibrate the diaphragm and thereby. produce the desired sound waves as the motor is rotated.

The marginal edge of the diaphragm is rigidly held between thev marginal edges of the base section 5- of the amplifier and rmg --8, both of which are concavo-convex in cross section arranged with their bases in juxta-position and secured together by suitable fastening means as screws -3l' so as to form a lenticular hollow receiver in which the greater portion of the diaphragm I is adapted to play.- I

The binding posts 201 are secured'in a suitable insulating bushing 32* in the outer end of the jacket 7 said bushing being composed of threaded sections for detachable connection one with the other, one of which sections-is rigidly secured tothe adjacent end of'the acket, while the outer sectionis provided-with a central aperture for receiving the adjacent ends of the'lead wires 34 which are also connected with a slip connection to the binding posts 20 and may be connected to anyfsuitable source of power and switch carried by the vehicle on which the horn is mounted. It will be seen from the foregoing description that the various arts ,of this device may be easily and quickly assembled and that when so assembled are firm and always maintain their proper relation to each other and at the same time by removing the jacket 7 and loosening the lock nut -11,'the shell 10 and ring -"8' may be rotarily and axially adjusted one upon the other to bring the-toothed wheel --27- and projection 29 lnto proper co-action either to made relatively to the projection 29- by adjusting the shaft 17 endwise through the medium of the adjusting screw 22.- by simply loosening the lock nut 24 In assembling the parts of my invention, re

the ring 8- and diaphragm 6- are secured in, the manner described to the adjacent end of the amplifier after which the motor shell 10- with the motor therein including the cap 19- and toothed wheel 27 may be screwed into the central threaded opening in the ring '8 and when the toothed wheel '27 is properly adjusted relatively to the projection 29, may be locked 'in'this position by the lock nut -11f. This adjustable connection between the ring --8- and shell 10 is more for the purpose of varying the degree of engagement between the teeth of the wheel --27- and projection 29- for varying the, tone, while the adjusting screw a removable cap across the open end and 1 providedwith a bearing for the motor shaft, a ring adjustable lengthwlse of and upon the shell, an amplifier secured'to the ring, a

diaphragm having its marginal edges secured between 'the amplifier and rmg, a

projection on the intermediate portion of the diaphragm, and atoothed wheel on the motor shaft operating against the projection to vibrate the diaphragm.

2. In ahorn, an electric motor having an inclosing cup-shaped shell threaded externally at one end, a removable open side of the shell and provided Wlth a bearing for the motor shaft, an nternally threaded ring screwed upon the threaded end-of the shell, an amplifier secured to the ring, afldiaphragm having its'marginal edges secured between the amplifier and ring, a projection on the intermediate portion of tor shaft operating against the projection to vibrate the diaphragm, and means for adjusting the motor shaft and toothed wheel axially toward the diaphragm.

I 3. In a horn, an electric motor having a cup-shape shell of magnetizable materlal, the base of the shell being threaded exter-- nally, an internally threaded ring screwed upon the base of the shell whereby the shell cap across the the diaphragm, a toothed wheel on the moi may be adjusted endwise in the ring, means diaphragm in the path of the teeth of the 10 for locking the shell in its adjusted posiwheel whereby the rotation of the wheel tion, a cap across the open side of the shell will cause the vibration of the diaphragm. and provided with a bearing for the motor In witness whereof I have hereunto set shaft whereby, said shaft may be adjusted my hand on this 6th dayof Ma 1912. endwise, a toothed wheel on the opposite WILLIAM PARKS.

end of the shaft, a diaphragm secured to Witnesses: the ring and extending across the adjacent LILLIAN WUNDERLICH, end of the shaft, and a projection on the W. J. Comm'rr. 

